[Needsdiagnosis] Show with the data graph a velocity parameter

[karlcow]

We could compute the velocity of the chart by showing if we are slowing down, if we are stable or if we are accelerating the process. It could be a second curve on the other one or above the other one.

How to compute it? (brainstorm mode).

Every hour we have a total number T. The differential is then T(n-1) - T(n) / 1h
so if the number is negative the project is slowing down and if positive it is accelerating.

• Per hour will probably be noisy and it might be better to do it by day or per week. So basically

Current_speed = T(24h ago)-T(now) / 24h
we can also shows speed variations over the project life: Speed(2 days ago) - Speed(1 day ago) / total_mean_speed.

• If the number is under from 0 to 1 the project is slowing.
• if the number is above 1 the project is accelerating.

Too long under 1 means we are entering a danger zone of backlog.